Test Preparation for DTC Readout

1. Connect Hand-Held Tester (HHT) to data link connector (X11/4) according to connection diagram (see section 0). 2. Ignition: ON. 3. Read DTC memory for transmission control module (N15/1). (if no DTC's are stored im DTC memory which are relative to the complaint, perform entire Electrical Test Program 23

DTC	Possible cause	Test step/Remedy 1)
-	No fault in system	In case of complaint: 23 (entire test)
	Engine control module (N3/4) does not match TCM (N15/1)	Reset and reactivate engine control module: See DM, Engines, Vol. 2, section 1.1 >11
	Transmission overload protection switch 4GR/5GR	23 9.0 Read out DTC memory for DI control module (N1/3) and Engine control module (N3/4): See DM, Engines, Vol. 2, section 5.2 to 5.3 >11 or 1.1 >11
	CAN data line from EA/CC/ISC control module (N4/1) distorted	23 10.0 Read out DTC memory for EA/CC/ISC control module (N4/1) See DM, Engines, Vol. 3, section 6.2 to 6.4 >11
	CAN data line from DI control module (N1/3) or HFM-SFI control module (N3/4) distorted	23 10.0 Read out DTC memory for DI control module (N1/3) and Engine control module (N3/4): See DM, Engines, Vol. 2, section 5.2 to 5.3 >11 or 1.1 >11

1) Observe Preparation for Test, see 22.

DTC	Possible cause	Test step/Remedy 1)
	CAN data line distorted	23 10.0. Read out DTC memory for EA/CC/ISC control module (N4/1): DM, Engines, Vol.3, section 6.2 to 6.4 11 Read out DTC memory for DI control module (N1/3) and Engine control module (N3/4): DM, Engines, Vol. 2, section 5.2 to 5.3 12 or 1.1 12 Read out DTC memory for ABS/ASR or ASR/SPS control module (N30/1 or 47-1): DM, Chassis and Drivetrain, Vol. 2, section 5.2 12 DM, Chassis and Drivetrain, Vol. 3, section 9.1 and 9.3 12
	Valve block control valve (Y3/1y2), open circuit orTCM (N15/1)	23 4.0 Replace N15/1
	TCM (N15/1)	Replace N15/1
2)	Valve block control valve (Y3/1y2)	23 4.0
	Valve block control valve (Y3/1y2), short circuit	23 4.0

1) Observe Preparation for Test, see 22. 2) If DTC is displayed, it may be attributable to previous repair work done on the vehicle. For example, the valve block connector (Y3/1x1) on the transmission was not connected/reconnected while the engine was idling > 1000 rpm. Clear DTC by using HHT. Start engine and idle at > 1000 rpm for approximately 10 seconds, check DTC with HHT, if DTC reappears, see 23 9.0.